In tandem with the similar thread re the 80s, let's take a stab at the 70 (one album per band, if possible). This might be even more difficult than the 80s thread!
1) Zep - Physical Graffiti
the rest in no true order:
Sabbath - Sabotage
Tull - Benefit
Deep Purple - In Rock
Priest - Stained Class
Rush - 2112
AC/DC - Let there be Rock
UFO - Force It
Free - Fire & Water
Aerosmith - Rocks
Kiss - Hotter Than Hell
Van Halen - debut
Rainbow -Rising
Yes - Close to the Edge
The Faces - A Nod is as good as a wink
Jeff Beck - Rough 'n Ready
Hendrix - Band of Gypsies
Floyd - Wish you were Here
robin Trower - Bride of Sighs
Traffic - Low Spark of High Heeled Boys
Wishbone Ash - Argus
Stones - Exile on Main St
1) Zep - Physical Graffiti
the rest in no true order:
Sabbath - Sabotage
Tull - Benefit
Deep Purple - In Rock
Priest - Stained Class
Rush - 2112
AC/DC - Let there be Rock
UFO - Force It
Free - Fire & Water
Aerosmith - Rocks
Kiss - Hotter Than Hell
Van Halen - debut
Rainbow -Rising
Yes - Close to the Edge
The Faces - A Nod is as good as a wink
Jeff Beck - Rough 'n Ready
Hendrix - Band of Gypsies
Floyd - Wish you were Here
robin Trower - Bride of Sighs
Traffic - Low Spark of High Heeled Boys
Wishbone Ash - Argus
Stones - Exile on Main St